Bending machine



April 15, 1930.

J. R. KERLIN BENDING MACHINE Original Filed Dec. 16, 1918 INVENTORJmsji. 192m A TTORNE Y Patented Apr. 15, 1930 u UNITED STATES JAMES R.xnnnm, or Los ANGELES, CALIFORNIA BENDING MACHINE Itefiled 'forabandoned application Serial No. 267,054, filed December 16, 1918.

18, 1924. Serial No. 720,875..

r This application is refiled for applicants abandoned applicationentitled Bending machine? Serial No.267,054 filed in the Patent OfiiceDecember 16, 1918.

My invention resides more particularly in a mechanism adapted for useinbending metallic bars, pipes, and other objects into pre determinedangles or curves.

An important to provide a bending machine in which all the clamping andbending jaws are adjustable.

A further object is to provide a simple means for relieving the strainon thej aw adjusting mechanism during a bending operation.

A still further object is to provide an easily operated locking meansfor rigidly securing the upper ends of the clamping jaws together duringthe operation of the machine.

A final object of myinvention isto provide a simple and inexpensivemechanism that is easy of. manipulation, and one in which the strainsconsequent to the bending operation are efficiently provided for.

j I accomplish the above objects by means of the machine. hereindescribed and illustrated in the accompanying drawings, in which:

Figure 1 is a top plan View of the machine with a piece of materialadjusted between the clamping jaws preparatory to bending into shape.

Fig. 2 is a side elevation.

Fig. 3 is a cross section taken on line 3-3 of Fig. 1.

Fig. 4 is a longitudinal cross section taken on line 4-4 of Fig. 1.

Fig. 5 is a detail cross sectional view illus trating one of the jawadjusting mechanism, taken on line 55 of Fig. 1.

Fig. 6 is an enlarged detail sectional view of the locking mechanism ofthe clamping aws.

i Fig. 7 illustrates a plan view of an iron bar after being bent atanacute angle by my machine.

Fig. 8 illustrates a plan view of aniron The improved bending apparatusforming object of my invention is drawing.

This application filed June comprises a casing or base 10 which issubstanti ally hollow in configuration, and preferably formed of castiron or steel. The base 1s provided around its edges or flanges 11 witha plurality of bolt holes 12 to receive bolts or other securing means,for rigidly maintaining the base against movement when. secured to asuitable framework or foundation (not shown). One edge of base 10 iscurved as at 13, and an upstanding track 14 is formed thereon. Track 14is preferably of arcuate form and extends along the curved edge 13, asclearly shown in Fig. 1 of the At the central point of track 14 is acircular raised portion 15 of the same heightas track '14, and isprovided with a centrally disposed threaded bore 16, through whichpasses the lower end of a screw threaded king bolt 17, adaptedtopivotally secure the movable bending member 18 imposition on the base10 of the machine, as will be more particularly described hereinafter.

Thebase 10 is also provided with a raised portlon 19, rectangular. inconfiguration,

upon which is adjustably mounted an abutment orbrace jaw 20. Raisedportion 19 is provided on its outer upper end with an upstanding wall 21formed integrally therewlth, and provided on its inner longitudinal edgewith a groove 22, the upper face of portion 19 is also provided with alongitudinally extending guide groove 28, the said groove having a slot25 therethrough near the inner formed in the upper face of the raisedportion 19. The outer upper face of abutment jaw 20 is provided with agroove 28, inclined with respect to the outer transverse edge of theabutment jaw. Wall 21 is provided at its center with a screw threadedaperture 30' in which is mounted an adjusting screw 31, the free endofsaid adjusting screw swivelly engaging the movable abutment jaw 20..

It will be. observed from the foregoing that by rotating screw 31, jaw20 would bemoved I Oil longitudinally along the upper face of the raisedportion 19 into the desired position. In order to rigidly maintain jaw20 in its adjusted position, and also to revent an upward or lateralmovement of the same during a bending operation, I provide an adjustingbolt 32, said bolt passing upwardly from the under face of portion 19through slot'25 and threaded aperture 33 formed in one of the corners ofjaw 20 and secured in position by a lock-nut 34, the end of said boltbeing provided with a screw driver slot so that an adjustrnent may bequickly made. The face of jaw 20 is provided with a web 36 to'insure itsstability when pressure is brought against the same.

' Bending member 18 is provided on one of its edges with a semi-circularboss or projec- 601141 formed integrally therewith, and having a countersunk bore 42 for the reception of the pivotal or kin bolt 17 the end ofsaid engaging the t .readed bore 16 formed in the circular raisedportion 15, a lock-nut 44 'securin the king bolt against movement whenthe lending member 18 is adjusted. The head of bolt 17 is slotted foradjustment purposes.

Formed integrally with the bending mem- 'ber '18, and lying parallelwith one of its edges, is an upstanding block or base 45, similar inconfiguration to the portion 19 iormed on base 10. This base 45 forms asupport *for a clamping 'aw 46, and is grooved on its upper face as at 4and provided-omits outer upper edge with anupstanding lug 48,

having a centrally disposed threaded bore 49, for the reception of a jawadjusting screw 50. Screw '50 swivelly engages the outer transverse edgeof jaw 46 .and on a rotation thereof the jaw canbe adjusted to thedesired position. The underface of jaw 46 is provided with a tongue 51,that engages the groove -47 formed on base -45 to guide the same duringits movement, and at the same time, revent any lateral movement thereof.whesdbor of-the .gr0ove47 is slotted longitudinally for the 2passagetherethrough of a headed bolt '52, the threaded-end o'fsaid boltengaging a threaded aperture 53 formed on the .inner end of the jaw 46.In adjusting jaw 46'the handle of the adjusting screw 50 is rotated soas to bring the jaw 46 into the proper-or desired position.

Mounted along the edge 54 of the bending member 18 is a raised portion55, similar in con mirat ion to the raised portion 45, and is providedon its upper face with a guide ,groove 56 adapted to engage a tongue 57formed on the under face of an adjustable clamping jaw 58. The outerupper end of raised portion 55 is provided with an upstanding lug '59which is provided with a centrally disposed threaded aperture 60 for thereceptiono'fa threaded adjustingbolt 61.

The upper end'of jaw '46 is provided with locking device.

a pair of lugs spaced apart for the reception of a jaw locking device 66which is pivoted therebetween. This locking device preferably consistsof a threaded socket 68 which is pivotally mounted between lugs 65 asclearly shown in Figs. 1 and 2 of the drawing. Engaging threaded socket68 of the jaw locking device, is a threaded bolt 69 provided on one endthereof with a head 70, having an apertured lug 71 extending therefrom,

.an operating handle 72 being attached thereto. To prevent the handlefrom becoming unduly hot during a bending operation (when the materialbeing bent is in a highly heated condition) a washer 73 is mounted onbolt 69 lying against the inner annular face of head 70, serving therebyto prevent an .unbroken flow of heat from the heated material to theoperating handle.

The upper end of clamps 46 and '58 are provided with semi-circularrecesses 74 for the reception of the socket 68 and bolt 69 of the Theradius of recess 74 in the upper-end of clamp '58 is greater than thediameter of bolt 69, thereby permitting of an adjustment of the clampingjaw "58 by means of the adjusting bolt 61. By employing a locking meansfor the two clamping jaws 46 and 58 all danger of the upper portions ofthe jaws spreading apart during a bending operation is avoided.

The outer face of track 14 is preferably provided with a pluralityofapertures 80, as clearly shown in dotted lines of Fig. 1 of the drawing.These apertures are threaded and are spaced apart an equal distance fromeach other and-are adapted to receive the threaded ends of adjustingbolts 81, these bolts rigidly maintaining an adjustablestop 82 inposition against the outer face of the circular track 14. By means ofthe adjustable stop the movement of the operating lever 83 attached tobending member 18 can be determined, and the exact angle can be formedin the material that is being bent.

By mounting the clamping jaws and the bending jaw in an adjustablemanner on the bending member 18 and the base '10 respectively, I amenabled to efi'ect an extremely fine adjustment of said aws so that thematerial which is being bentmay be bent atany desired angle accurately.By adjustably mounting one of the clamping jaws 58 I am enabled toredress the surface or material bending wall 86 of the j aw if the sameshould become pitted or roughened from constant bending operations. Whenthe jaw is in such a condition it may be removed and the surface86planed off smoothly and then the jaw can be adjusted by means of theadjustnism I have provided a wedge which is adapted to seat in thegrooves 22 and 28, said wedge relieving all strain upon the screwthreads of the adjusting bolt 31, and also all strain that might beimposed on the adjusting bolt 32 which adjustably secures the jaw inposition on the base 10,

In a bending operation the bar which is to be bent is first placedbetween the clamping jaws 46 and 58 and the locking mechanism is thenswung into position to rigidly maintain the upper portions of jaws 46and 58 against spreading. The adjusting gauge 82 is then moved intoposition on the outer w face of the circular track 14 and the handle 83is then operated to move the bending member 18 and complete the bendingoperation. N hen it is desired to bend the bar 90 into a curved angle asshown in Fig. 8 of the drawings, jaw 20 is moved rearwardly and awayfrom the center of base 10, or to get a more perfect are at the bend,the jaw 58 may be also adjusted away from the center of rotation, to thesame extent as that of jaw 20.

From the above description it will be noted that I have produced abending machine on which an extremely fine adjustment may be made of allthe jaws, so that the bending of metallic bars, pipes, etc., may beaccurately accomplished.

What I claim is:

1. In a metal bending machine, a base member provided with an abutment,a bending member pivotally mounted on said base member, a pair ofclamping jaws slida bly mounted on'said bending member forindependentadjustment thereon, the work face of one of said clamping jaws beingadapted at all times to slide in a radial direction with respect to thecenter of rotation of said bending member, the work face of saidabutment being in substantial alignment with the opposed work faces ofsaid clamping jaws before the bending operation, and means for adjustingsaid abutment out of such alignment.

2. In a metal bending machine, a base member provided with an abutment,a bending member pivotally mounted on a said base member, a pair ofclamping jaws mounted on said bending member, the work face of saidabutment being in substantial alignment with the work faces of saidclamping jaws before the bending operation, means for adjusting saidclamping jaws angularly with respect to each other, the work face of oneof said clamping jaws being adapted at all times to slide in a radialdirection with respect to the center of rotation of said bending member,and means for adjusting said abutment out of alignment with the workfaces of said clamping jaws.

3. In a metal bending machine, a base member provided with an abutment,a bending member pivotally mounted on said base member, a pair ofclamping jaws slidably mounted on said bending member for independentadjustment thereon, the work face of one of said clamping jaws beingadapted at alltiines to slide in a radial direction with respect to thecenter of rotation' of said bending member, means for adjusting one ofsaid clamping jaws relative to the other, and means for adjusting saidabutment substantially in the plane of said bending member, both of saidadjusting means being operable from the same side of the machine whenthe bending member is in its operative position prior to the bendingoperation.

4. In a metal bending machine, a base member provided with an adjustableabutment jaw, a bending member pivotally mounted on said base member, apair of clampingjaws adjustably mounted on said bending member, andmeans for relieving the strain on the adjusting mechanism of theabutment jaw during a bending operation.

f. In a metal bending machine, a base member provided with an adjustableabutment jaw, a bending member pivotally mounted to swing on said basemember, a pair of clamping jaws mounted on said bending member, means toadjust each of said clamping jaws, and means for relieving the strain onthe adjusting mechanism of the abutment jaw during a bending operation'6. In a metal bending machine, in combination with a base, an abutmentjaw afiixed thereto, means to adjust said jaw, a movable memberpivotally secured to said base, a pair of clamping jaws ai'fixedthereto, and means for relieving the strain on the abutment jawadjusting mechanism during a bending operation.

7. In a metal bending machine, in combination with a base, an adjustableabutment jaw secured to said base, mechanism for adjusting said jaw, awedge shaped member adapted to engage said jaw and to relieve the strainon the jaw adjusting mechanism during a bending operation, a movablemember pivotally secured to said base, a pair of clamping jaws mountedon said base, means to adjust each of said clamping jaws independentlyof the other, and a locking means for the upper end of said clampingjaws.

8. In a metal bending machine, a base member provided with an adjustableabutment and a bending member pivotally mounted on said base memberprovided with a pair of independently adjustable clamping jaws, the workface of one of said clamping jaws being adapted at all times to slide ina radial direction with respect to the center of rotation of saidbending member.

9. In a .metal bending machine, a base member provided with anadjustable abutment, a bending member pivotally mounted on said basemember provided with a pair of independently adjustable clamping jaws,

like work face of .one of said clamping jaws beingladapted at all timesto slide in a radial dinection with respect to the center of rotationofSaid bending member, and means for locking said abutment andclampingjaws in adjusted position.

10. In a metal bending machine, a base member provided with anadjustable abutment and a bending member pivotally mounted-0n said basemember provided with v a pair of clamping members adjustable angular-1ywith respect to each other, the work face of one of said clamping jawsbeing adapted at all times to slide in a radial direction with respectto the center of rotation of said bending member.

In witness that I claim the foregoing I have hereunto subscribed my namethis 11th day of June, 1924.

JAS. R. KERLIN.

